A Custom Heating and Air Conditioning recently came out on a service call to clean and check the furnace and AC system. I also had a couple of leaks in the gas line to the furnace which they fixed, and they replaced the wiring for a ground on the outdoor condenser for the AC. I wasn't actually there when they came. I had a friend who was there to watch the process but I've personally only seen the results, which have been good. The price was reasonable. One minor complaint is that they were going to get back to me with a quote to install a water heater but they never did.